<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    /**css**/
    .ani {
        width: 480px;
        height: 320px;
        margin: 50px auto;
        overflow: hidden;
        box-shadow: 0 0 5px rgba(0, 0, 0, 1);
        background-size: cover;
        background-position: center;
        -webkit-animation-name: "loops";
        -webkit-animation-duration: 20s;
        -webkit-animation-iteration-count: infinite;
    }

    @-webkit-keyframes "loops" {
        0% {
            background: url(http://d.hiphotos.baidu.com/image/w%3D400/sign=c01e6adca964034f0fcdc3069fc27980/e824b899a9014c08e5e38ca4087b02087af4f4d3.jpg) no-repeat;
        }

        25% {
            background: url(http://b.hiphotos.baidu.com/image/w%3D400/sign=edee1572e9f81a4c2632edc9e72b6029/30adcbef76094b364d72bceba1cc7cd98c109dd0.jpg) no-repeat;
        }

        50% {
            background: url(http://b.hiphotos.baidu.com/image/w%3D400/sign=937dace2552c11dfded1be2353266255/d8f9d72a6059252d258e7605369b033b5bb5b912.jpg) no-repeat;
        }

        75% {
            background: url(http://g.hiphotos.baidu.com/image/w%3D400/sign=7d37500b8544ebf86d71653fe9f9d736/0df431adcbef76095d61f0972cdda3cc7cd99e4b.jpg) no-repeat;
        }

        100% {
            background: url(http://c.hiphotos.baidu.com/image/w%3D400/sign=cfb239ceb0fb43161a1f7b7a10a54642/3b87e950352ac65ce2e73f76f9f2b21192138ad1.jpg) no-repeat;
        }
    }
</style>

<body>
    <div class="ani">

    </div>
</body>

</html>